Answer:
Proteins are macromolecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs
 
        
             
        
        
        
- 24 micron m^2 represents the value of the surface area.
- Surface area has unit of m^2.
<u>Answer:</u>
<u>surface area</u>
Hope you could understand.
If you have any query, feel free to ask.
 
        
             
        
        
        
Answer:
availability of resources.
Explanation:
Availability of resources is abiotic factor which is responsible for the decrease in population in 1990 because when the population reaches its carrying capacity so the organisms compete with each other and due to limited resources such as food etc the decrease occurs in population. Infection is also occurs when there is high population due to which death occurs and population of organism decreases.
 
        
             
        
        
        
The answer to the question is possibly A